At times the systems in your managed environment may need some maintenance work done. This can be unexpected and can occur randomly. In this case the system is experiencing an unplanned outage. If the outage is known in advance and planned, for example, to install a new Service Pack on the system, the system is undergoing a scheduled or planned outage.
The same applies to services. A service can experience an unplanned outage, for example because the system that hosts the service goes down. It can also experience a planned outage, for example because an application must be upgraded to a newer version.
During the outage, the HP Operations agent on the system may continue to send messages, even though the problem is already known to the administrator or even expected. To avoid unnecessary messages, you can instruct HPOM to temporarily put the managed node, node group, external node, or service into maintenance mode.
When a node or service is in maintenance mode, its status by default does not affect the status of its parent node groups or parent services.
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